Malicious PDF — malware analysis report

Static analysis result for SHA-256 19387fa21a067c6e…

MALICIOUS

PDF

120.3 KB Created: 2021-08-18 11:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01488c12c67ce4dd6ba7f0bd287d9c4e SHA-1: cdb99030f37dd6b66c6d484497345a87da14c125 SHA-256: 19387fa21a067c6e1a36b675269a1303564f2da7ad88aeca0a61a18dfb326dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded URLs and link farm structure are indicative of a spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ozmutludokum.com/userfiles/file/podegape.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2gs06kse6e0je13dhlju2n4pq7/toxagejulogakafaloxaxige.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/66111913879.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/xuduwasebovos.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/97456819793.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/sevalezu.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/putufezetixukobimubekanut.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/59094961503.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/60426505334.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dd0a2ceceba5201029c2b4ea827e483d/bigesox.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82949cd8a2---89283069508.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/105d471247a92f72cc88cdb5fc425186/81967686185.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/34678504955.pdfIn PDF document text
    • https://noventa.cz/media/files/file/gopaxamezerezukezikurazap.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4405899c073eab15dc5052a843eeea17/7928076609.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/putesogogokovoxewevoj.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/fisepugizu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f1a98d41691a4bcea37b6eb3b62cba85/42806586226.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a32cd44798a---3312807053.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/70518445291.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ad90522ebd8b0f756275f9b1db3dd91b/zukegode.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/74263c19ae6f88fa39899020480acaa2/35528046817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=spider+man+comics+for+salePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000172ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172EE 17584 bytes
SHA-256: 1998871511bde9daa58ce1354d4025be6adad69bbec047125fde91e050e42a75
font_01_sfnt_off0001a17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B996 10760 bytes
SHA-256: a523745dca4d0ccdb7c9535e8ec0094385281cd042df1b77ed0cdc45d4518751

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